BRAKE LIGHTS AND DRIVER BLINKER ARENT WORKING AT ALL, HOW DO I FIX THEM? BULBS ARE GOOD.

1962 Chevrolet Nova • 119,500 miles

I just bought my 62 nova 300 four door. The guy said the break lights and blinkers dont work as well as the stereo comming on but not playing music. Ive tried everything I can think of short of pulling the steering wheel to figure out the wiring problems with the back end. The passenger blinker works just fine as well as the headlights. A side from these problems the only thing else wrong with the car seems to be it has some problems starting up. The seller said its due to him putting on a cheap carburator any thoughts on what carb would work best for it? Im mechanically incline just havent worked on a car since I was 15 and used to help my uncle. Any help would be great!